refactor: extract place-search and routing provider modules

server/providers/places.js

@@ -0,0 +1,6 @@
+/** Place-search and route middleware for Node development servers. */
+export { googlePlacesContextProxy } from './places/google.js';
+export { googleServerApiKey, keylessGooglePlacesResponse } from './places/google-key.js';
+export { installRouteMiddleware } from './places/routes.js';
+export { makeRateLimiter, makeOptInRateLimiter, clientKey } from './common/rate-limit.js';
+export { haversineKm } from './common/geo.js';